<!doctype html>
<meta charset="utf-8">
<script src='/resources/testharness.js'></script>
<script src='/resources/testharnessreport.js'></script>
<link rel="author" title="Joy Yu" href="mailto:joysyu@mit.edu">
<link rel="help" href="https://drafts.csswg.org/css-tables-3/#computing-the-table-width">
<style>
    td {
        padding: 0;
    }
</style>
<h1>Visibility collapse</h1>
<a href="https://drafts.csswg.org/css-tables-3/#computing-the-table-width">Spec</a>
<p>
Setting a spanning column to visibility:collapse changes table width but
not height. The middle column has been collapsed.
</p>
<table id="test" style="border-spacing: 0;">
  <col style="background-color:red;">
  <col style="background-color: blue; visibility: collapse;">
  <col style="background-color: green;">
  <tr>
    <td><div style="width: 10px; height: 10px"></div></td>
    <td><div style="width: 10px; height: 10px"></div></td>
    <td><div style="width: 10px; height: 10px"></div></td>
  </tr>
  <tr>
    <td><div style="width: 10px; height: 10px"></div></td>
    <td><div style="width: 10px; height: 10px"></div></td>
    <td><div style="width: 10px; height: 10px"></div></td>
  </tr>
  <tr>
    <td><div style="width: 10px; height: 10px"></div></td>
    <td><div style="width: 10px; height: 10px"></div></td>
    <td><div style="width: 10px; height: 10px"></div></td>
  </tr>
  <tr>
    <td colspan="3"><div style="width: 30px; height: 10px"></div></td>
  </tr>
</table>

<script>
    tests = [
        [
            document.getElementById('test').offsetHeight,
            40,
            "col visibility:collapse doesn't change table height",
        ],
        [
            document.getElementById('test').offsetWidth,
            20,
            "col visibility:collapse changes table width"
        ]];
    for (i = 0; i< tests.length; i++) {
        test(function()
            {
                assert_equals.apply(this, tests[i]);
            },
            tests[i][2]);
    };
</script>
</html>